i7 3820 vs 3930K for proffesional music DAW

I built a computer specs and I do not know which CPU to choose:

The i7 3820 or the i7 3930K?

Is the 3930K worth the cost over the 3820?

(I am going to use Heavy VST INSTRUMENT like NI , EWQL and heavy plugins such as WAVES etc…)

I did not find sites which does benchmarking of CPU and other PC components for music DAW mostly only for games…

Can you suggest such sites?

I have to mention that I don’t want to do OC.

Thank You!

see new system thread below